US20010022775A1 - Optical disk and method of manufacturing the same - Google Patents

Optical disk and method of manufacturing the same Download PDF

Info

Publication number
US20010022775A1
US20010022775A1 US09/291,953 US29195399A US2001022775A1 US 20010022775 A1 US20010022775 A1 US 20010022775A1 US 29195399 A US29195399 A US 29195399A US 2001022775 A1 US2001022775 A1 US 2001022775A1
Authority
US
United States
Prior art keywords
disk
disk member
projection
groove
members
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US09/291,953
Other versions
US6404730B2 (en
Inventor
Woon-Sung Yeo
Hyung-Kyu Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS, INC. reassignment LG ELECTRONICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, HYUNG-KYU, YEO, WOON-SUNG
Publication of US20010022775A1 publication Critical patent/US20010022775A1/en
Application granted granted Critical
Publication of US6404730B2 publication Critical patent/US6404730B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1406—Ultraviolet [UV] radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1448—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface radiating the edges of the parts to be joined, e.g. for curing a layer of adhesive placed between two flat parts to be joined, e.g. for making CDs or DVDs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
    • B29C65/1467—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4845—Radiation curing adhesives, e.g. UV light curing adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7808—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7808—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots
    • B29C65/7811—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of holes or slots for centring purposes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/24003—Shapes of record carriers other than disc shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/521—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by spin coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • B29L2017/005—CD''s, DVD''s

Definitions

  • the present invention relates generally to an optical medium and a method for manufacturing the optical medium, and more particularly, but not by way of limitation, to an optical disk and a method for manufacturing the optical disk using an improved bonding and centering method for reducing errors caused by conventional bonding processes.
  • DVD Digital Video Disc
  • the diameter and thickness of a conventional DVD are typically 12 cm and 0.6 mm, respectively.
  • the conventional DVD has exactly one-half of the thickness of the conventional CD.
  • the conventional DVD having the thickness of only 0.6 mm is extremely difficult to carry because it is so thin and susceptible to bending and damages.
  • currently available DVDs are formed by bonding two identical disk members to each other, each disk member having a thickness of 0.6 mm.
  • the currently available DVDs offer good portability because of an increased thickness, and has a high storage capacity since information can be recorded on both sides of the DVD.
  • a photo resist is deposited uniformly on a well-polished glass plate (also known as a glass master substrate), and desired information is recorded on the glass plate by sensitizing the photo resist using a laser beam modulated according to the information to be recorded.
  • a glass master is obtained by developing the photo resist and a metal master is obtained by electroplating the obtained glass master. Then, several mothers can be obtained from the metal master, and subsequently several stampers can be obtained from the mothers. This process is commonly called a mastering process.
  • a stamper provided by the mastering process is adjusted to fit into an injection molding machine, so that an injection molding process is performed to produce a transparent substrate.
  • the injection molding process injects a polycarbonate resin into the mold containing the stamper, whereby a transparent disk member is obtained.
  • the obtained transparent disk member is coated with an aluminum reflective film by a sputtering process, which sputters and places metal ions on the transparent substrate.
  • a UV bonding material e.g., UV resin
  • the UV bonding material is dropped onto the central part of the disk member while the disk is rotated at a high speed.
  • the high-speed rotation of the disk member creates centrifugal force by which the UV bonding material is instantaneously and uniformly distributed over the entire disk member.
  • the UV bonding material is cured by irradiating ultraviolet rays on the disk member, whereby a protective layer is formed on the disk member to prevent oxidation of the coated aluminum reflective film.
  • each disk member having a 0.6 mm thickness is bonded to each other to form a conventional DVD.
  • the spin-coating method, hot-melting method, and double-sided tape method are generally used, among which the spin coating method is the most common.
  • radical method uses the spin coating process to bond the two disk members to form a conventional DVD.
  • the two methods are similar in that UV bonding materials are applied to the substrate by the spin coating method.
  • a difference between the two methods is that the radical method conducts the bonding process before curing the UV bonding materials, whereas the cationic method completes curing the UV bonding materials before the disk bonding process.
  • the radical method can be considered more common than the cationic method.
  • FIG. 1 is a flowchart showing a conventional bonding process for forming a conventional DVD.
  • a first disk member is transferred to a bonding machine in Step S 101 .
  • a UV bonding material is applied onto the central part of the first disk member while the first disk member is rotated at a low speed in Step S 105 .
  • a second disk member is placed on top of the first disk member and the first and second disk members are rotated at a high speed.
  • the centrifugal force created by the high-speed rotation of the first and second disk members uniformly spreads the UV bonding material over the surfaces of the first and second disk members, thereby securely bonding the first and second disk members to each other in Step S 107 .
  • Step S 109 ultraviolet rays are irradiated onto the rotating bonded disk members to cure the UV bonding material, and the bonded disk members are unloaded in Step S 111 , whereby the bonding process is completed and a conventional DVD is manufactured.
  • the centering problem of the conventional bonding process can be solved if the injection molding machine can produce disk members having an identical center hole diameter or if the center hole of the jig can be adjusted to perfectly match that of the substrate.
  • the centering process of conventional bonding processes has been a major obstacle in the DVD manufacturing process.
  • the bonding process is a significant part of the DVD manufacturing process, any errors caused by the bonding process increase the production cost.
  • An object of the present invention is to provide an optical medium and a method for manufacturing the optical medium, capable of reducing errors caused by a centering process using a simpler bonding method.
  • the present invention is directed to a disk medium, including a first disk member having a penetrating hole, and a second disk member having a projecting portion, the projecting portion being placed within the penetrating hole of the first disk member, whereby the first and disk members are combined.
  • the present invention is further directed to a method of manufacturing an optical medium, including forming a first disk member having a penetrating hole, forming a second disk member having a projecting portion, and positioning the projecting portion of the second disk member within the penetrating hole of the first disk member, whereby the first and second disk members are combined to manufacture an optical medium.
  • FIG. 1 is a flowchart showing a bonding process employed in a conventional disk manufacturing method
  • FIGS. 2A and 2B show cross-sectional views of first and second disk members of an optical disk, respectively, according to a first embodiment of the present invention
  • FIGS. 2C and 2D are cross-sectional views of the optical disk according to the first embodiment of the present invention.
  • FIG. 3 shows an example of general dimensions of an optical disk according to the embodiments of the present invention
  • FIG. 4A shows cross-sectional and top views of a first disk member of an optical disk according to a second embodiment of the present invention
  • FIG. 4B shows cross-sectional and top views of a second disk member of the optical disk according to the second embodiment of the present invention
  • FIGS. 4C and 4D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 4A and 4B according to the second embodiment of the present invention.
  • FIG. 5A shows cross-sectional and top views of a first disk member of an optical disk according to a third embodiment of the present invention
  • FIG. 5B shows cross-sectional and top views of a second disk member of the optical disk according to the third embodiment of the present invention.
  • FIGS. 5C and 5D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 5A and 5B according to the third embodiment of the present invention.
  • FIG. 6A shows cross-sectional and top views of a first disk member of an optical disk according to a fourth embodiment of the present invention.
  • FIG. 6B shows cross-sectional and top views of a second disk member of the optical disk according to the fourth embodiment of the present invention.
  • FIGS. 6C and 6D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 6A and 6B according to the fourth embodiment of the present invention.
  • FIG. 7A shows cross-sectional and top views of a first disk member of an optical disk according to a fifth embodiment of the present invention.
  • FIG. 7B shows cross-sectional and top views of a second disk member of the optical disk according to the fifth embodiment of the present invention.
  • FIGS. 7C and 7D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 7A and 7B according to the fifth embodiment of the present invention.
  • FIG. 8A shows a cross-sectional view of a first disk member of an optical disk according to a sixth embodiment of the present invention.
  • FIG. 8B shows a cross-sectional view of a second disk member of the optical disk according to the sixth embodiment of the present invention.
  • FIG. 8C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 8A and 8B according to the sixth embodiment of the present invention.
  • FIG. 9A shows across-sectional view of a first disk member of an optical disk according to a seventh embodiment of the present invention.
  • FIG. 9B shows a cross-sectional view of a second disk member of the optical disk according to the seventh embodiment of the present invention.
  • FIG. 9C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 9A and 9B according to the seventh embodiment of the present invention.
  • FIG. 10A shows a cross-sectional view of a first disk member of an optical disk according to a eighth embodiment of the present invention.
  • FIG. 10B shows a cross-sectional view of a second disk member of the optical disk according to the eighth embodiment of the present invention.
  • FIG. 10C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 10A and 10B according to the eighth embodiment of the present invention.
  • FIGS. 2A and 2B respectively show cross-sectional views of first and second disk members of an optical disk according to the first embodiment of the present invention.
  • the first disk member 10 includes a penetrating hole 11 having a diameter of 35 mm (instead of a standard-sized center hole), and has a thickness of 0.6 mm.
  • the second disk member 13 as shown in FIG. 2B includes a cylindrical-shaped projecting portion 15 formed at the center of the second disk member 13 , and a ring portion 19 surrounding the projecting portion 15 .
  • the projecting portion 15 has a diameter of 35 mm and includes a center hole 17 having a diameter of 15 mm.
  • Each of the first and second disk members 10 and 13 has an overall diameter of 120 mm.
  • the thickness of the ring portion 19 of the second disk member 13 is 0.6 mm and the thickness of the projecting portion 15 is 1.2 mm.
  • the projecting portion 15 of the second disk member 13 is inserted into the penetrating hole 11 of the first disk member 11 .
  • the total thickness of the first and second disk members 10 and 13 as bonded to each other is uniformly at 1.2 mm.
  • FIGS. 2 A- 2 D A method of manufacturing an optical disk according to the first embodiment of the present invention is described below referring to FIGS. 2 A- 2 D.
  • the second disk member 13 is loaded on a motor shaft of an injection machine and is rotated at a low speed of, e.g., about 30 ⁇ 40 rpm. Then, a UV bonding material is applied onto inner parts (e.g., 17 ⁇ 18 mm from the center) and outer parts (e.g., 118 mm from the center) of the second disk member 13 as shown in FIG. 2B, wherein an appropriate time duration for the application of the UV bonding material may be, e.g., for a 1 1 ⁇ 4 disk revolution.
  • the areas of the second disk member 13 onto which the UV bonding material are applied should have a good optical transmissivity so that the bonding material is easily cured when it is exposed to ultraviolet rays.
  • UV bonding material may be applied only onto the areas of the second disk member 13 with no recording or reflective layer (i.e., where data are not recorded).
  • the first disk member 10 is stacked up on top of the second disk member 13 by placing the projecting portion 15 of the second disk member 13 within the penetrating hole 11 of the first disk member 10 . Subsequently, the stacked first and second disk members 10 and 13 are rotated at a high speed of, e.g., about 3000 rpm, as shown in FIG. 2C to uniformly spread the applied UV bonding material over the entire surfaces of the disk members 10 and 13 .
  • the bonded disk members 10 and 13 are further rotated during which ultraviolet rays are irradiated onto the UV bonding material of the disk members 10 and 10 to cure the UV bonding material, as shown in FIG. 2D. Then labels can be printed on the bonded disk members 10 and 13 to form an optical disk 100 .
  • the overall shape of the optical disk 100 is the same or substantially the same as a standard optical disk formed with two identical disk members. Further, since only the second disk member 13 has the center hole 17 , centering is required only for the second disk member 13 during the bonding process, whereby errors due to centering problems are eliminated or significantly reduced. Furthermore, since the UV bonding material is applied only onto the non-recording areas of the optical disk 100 , only a small amount of bonding material is used for each optical disk 100 . Moreover, the bonding material can be easily cured using low-powered ultraviolet rays.
  • FIG. 4A shows cross-sectional and top views of a first disk member of an optical disk
  • FIG. 4B shows cross-sectional and top views of a second disk member of the optical disk
  • FIG. 4C and 4D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 4 B and 4 C, all according to the second embodiment of the present invention.
  • the overall dimensions of the first and second disk members in the second embodiment can be the same as those in the first embodiment.
  • a first disk member 20 includes a penetrating hole 21 formed at the center of the first disk member 20 , and a groove 26 circumferentially formed on its inner sidewalls.
  • the thickness of the first disk member 20 can be, e.g., 0.6 mm, and the diameter of the penetrating hole 21 can be, e.g., 35 mm.
  • a second disk member 23 as shown in FIG. 4B has a projection 28 circumferentially formed on the outer sidewalls of a projection portion 25 , a center hole 27 formed at the center of the projection portion 25 , and an outer ring portion 29 .
  • the projection 28 is fitted into the groove 26 of the first disk member 20 .
  • only one disk member (the second disk member 23 ) has the center hole 27 .
  • the depth of the groove 26 can be selected so that the groove 26 remains within the clamp area with a diameter of 50 mm, so as to prevent damages to the recording layer which may be caused by the groove 26 .
  • a UV bonding material can be applied only onto the outer parts of the second disk member 23 as shown in FIG. 4B. Then the first and second disk members 20 and 23 are fitted to each other as shown in FIG. 4C. The high speed rotation of the fitted disk members 20 and 23 causes the UV bonding material to be uniformly distributed to the surfaces of the disk members 20 and 23 . Thereafter, ultraviolet rays are irradiated only onto the areas indicated by arrows as shown in FIG. 4D to manufacture an optical disk 200 (e.g., DVD), because the inner parts of the disk members 20 and 23 are secured by the cooperation of the projection 28 with the groove 26 as shown in FIG. 4C.
  • an optical disk 200 e.g., DVD
  • FIGS. 5 A- 5 D illustrate steps for manufacturing an optical disk according to the third embodiment of the present invention.
  • the third embodiment is similar to the second embodiment including the general dimensions of the disk members, except that the projection and groove are formed on the different disk members.
  • a first disk member 40 has a penetrating hole 41 with a projection 48 circumferentially formed on its inner sidewalls 44 as shown in FIG. 5A.
  • a second disk member 43 includes a circumferentially disposed groove 46 on the outer sidewalls 51 of the projecting portion 45 as shown in FIG. 5B.
  • the second disk member 43 further includes a center hole 47 formed at the center of the disk member 43 and the projection-portion 45 , and an outer ring portion 49 .
  • the area onto which a UV bonding material is applied and the area onto which ultraviolet rays are irradiated are the same as the second embodiment. Accordingly, an optical disk 300 is manufactured.
  • FIGS. 6 A- 6 D illustrate steps for manufacturing an optical disk according to the forth embodiment of the present invention.
  • the overall shape and dimensions of each of the first and second disk members are similar to those of the first embodiment.
  • a ring-shaped groove 66 e.g., circumferentially formed groove
  • a second disk member 63 has a projection 68 circumferentially formed at a prescribed distance from a projecting portion 65 , and the projection 68 is fitted into the groove 66 as shown in FIG. 6C.
  • a center hole 67 is formed only in the second disk member 63 .
  • FIGS. 7 A- 7 D illustrate steps for manufacturing an optical disk according to the fifth embodiment of the present invention.
  • a first disk member 80 includes a penetrating hole 81
  • a second disk member 83 includes a projecting portion 85 with a center hole 87 .
  • the dimensions of these elements are the same as the previous embodiments.
  • a groove 86 and a projection 88 are formed on the outer circumferential portions of first and second disk members 80 and 83 , respectively.
  • a UV bonding material is applied only onto an inner area of the second disk member 83 as shown in FIG. 7B, and the UV bonding material is uniformly distributed due to the rotation of the fitted first and second disk members 80 and 83 .
  • Ultraviolet rays are also applied only on an inner area of the combined first and second disk members 80 and 83 as shown by arrows in FIG. 7D. As a result, an optical disk 500 is manufactured.
  • FIG. 8A shows a cross-sectional view of a first disk member of an optical disk
  • FIG. 8B shows a cross-sectional view of a second disk member of the optical disk
  • FIG. 8C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 8A and 8B, all according to the sixth embodiment of the present invention.
  • a first disk member 90 includes a penetrating hole 92 with a first groove 91 formed circumferentially on its inner walls, and a second ring-shaped groove 96 formed on the outer parts of the first disk member 90 .
  • a second disk member 93 has projections 91 ′ and 98 ′ formed circumferentially on the outer walls of a projecting portion 95 and the outer parts of the second disk member 93 , respectively, as shown in FIG. 8B.
  • the projections 91 ′ and 98 ′ are to be inserted into the grooves 91 and 98 , respectively.
  • a center hole 97 is formed only at the center of the second disk member 93 .
  • the inner and outer parts of the first and second disk members 90 and 93 are securedly fitted to each other by the cooperation of the projections 91 ′ and 98 ′ with the grooves 91 and 98 as shown in FIG. 8C.
  • an optical disk 600 is manufactured without having to apply a UV bonding material and a UV curing process, thereby greatly simplifying the disk manufacturing process.
  • the general dimensions and shapes of the first and second disk members 90 and 93 are similar to the previous embodiments.
  • FIG. 9A shows a cross-sectional view of a first disk member of an optical disk
  • FIG. 9B shows a cross-sectional view of a second disk member of the optical disk
  • FIG. 9C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 9A and 9B, all according to the seventh embodiment of the present invention
  • a first disk member 101 includes a ring-shaped groove 106 on the outer parts of the first disk member 103 , which is similar to that of the sixth embodiment. In this example, however, it is not a groove but a projection 105 that is formed on the inner walls of a penetrating hole 102 of the first disk member 101 .
  • a second disk member 103 as shown in FIG. 9B includes a projection 106 ′ and a groove 105 ′, which are respectively fitted with the groove 106 and projection 105 of the first disk member 101 , whereby an optical disk 700 is manufactured.
  • the second disk member 101 includes a projection portion 104 and a center hole 107 .
  • the general dimensions and shape of the disk members 101 and 103 can be similar to the previous embodiments.
  • FIG. 10A shows a cross-sectional view of a first disk member of an optical disk
  • FIG. 10B shows a cross-sectional view of a second disk member of the optical disk
  • FIG. 10C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 10A and 10B, all according to the eighth embodiment of the present invention.
  • a first disk member 110 includes a penetrating hole 107 at the center thereof, and first and second ring-shaped grooves 115 and 116 at the inner and outer portions of the first disk member 110 .
  • a second disk member 113 as shown in FIG. 10B includes a projection portion 114 with a center hole 117 , and first and second projections 115 ′ and 116 ′ at the inner and outer portions of the second disk member 113 .
  • the first and second projections 115 ′ and 116 ′ are respectively fitted with the first and second grooves 115 and 116 , whereby an optical disk 800 is manufactured.
  • the method of manufacturing an optical disk according to the first through eighth embodiments of the present invention forms a center hole only on one disk member of the optical disk, thereby effectively reducing manufacturing errors caused by conventional processes of centering two identical disk members.
  • a small amount of a UV bonding material is applied only onto the areas with no recording and reflective layers and with high optical transmissivity, whereby curing of the UV bonding material with low-powered ultraviolet rays is permitted and the disk bonding/manufacturing process is significantly simplified.
  • the embodiments of the present invention are applicable to DVDs, DVD-RS, DVD-Rams, DVD-Rows, or the like, which can require two-sided recording capability.
  • the present invention makes it easier to load and unload an optical disk, e.g., DVD, on a clamping device of a disk drive which installs the disk by pressing the upper side of the optical disk, and prevents irregular rotation of the disk.
  • a DVD manufactured by conventional methods has a gap in an attachment area created when two disk members are bonded.
  • a ball in the clamping device elastically supported by a spring is inserted to the gap, which obstructs loading and unloading of the DVD.
  • the center of one disk member automatically coincides with that of the other disk member when the two disk members are bonded to or combined with each other because only one disk member has a center hole to be positioned within a projecting portion of the other disk member.
  • bonding of the two disk members can be easily conducted even without using sensors for disk centering.
  • no gap is created in the inner side of the projecting portion of the disk member, which facilitates loading and unloading of the finally manufactured optical disk and prevents irregular rotation of the optical disk.
  • the use of UV bonding material and the curing process may be completely eliminated by using projections and grooves on the disk members.
  • the invention may be embodied in other specific forms without departing from the sprit or essential characteristics thereof.
  • the dimensions of the disk members can be varied according to need and desire, a different bonding material or the like may be used instead of a UV bonding material, and the projections and grooves may be selectively formed at different locations or circumferential portions of the disk members.
  • the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Abstract

A disk medium and a method of manufacturing the disk medium are disclosed. The disk medium includes a first disk member having a penetrating hole, and a second disk member having a projecting portion, wherein the projecting portion is placed within the penetrating hole of the first disk member to form the optical medium. The method includes forming a first disk member having a penetrating hole, forming a second disk member having a projecting portion, and positioning the projecting portion of the second disk member within the penetrating hole of the first disk member, whereby the first and disk members are combined to form an optical medium.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention relates generally to an optical medium and a method for manufacturing the optical medium, and more particularly, but not by way of limitation, to an optical disk and a method for manufacturing the optical disk using an improved bonding and centering method for reducing errors caused by conventional bonding processes. [0002]
  • 2. Description of the Related Art [0003]
  • Digital Video Disc (DVD) is an optical information recording medium capable of storing a large amount of high definition image data. Due to its various advantages such as good portability and high storage capacity, the DVD has received much attention as the new information recording medium for the next generation. [0004]
  • The diameter and thickness of a conventional DVD are typically 12 cm and 0.6 mm, respectively. Compared to a conventional Compact Disc (CD) having a diameter of 12 cm and a thickness of 1.2 mm, the conventional DVD has exactly one-half of the thickness of the conventional CD. The conventional DVD having the thickness of only 0.6 mm, however, is extremely difficult to carry because it is so thin and susceptible to bending and damages. For this reason, currently available DVDs are formed by bonding two identical disk members to each other, each disk member having a thickness of 0.6 mm. As a result, the currently available DVDs offer good portability because of an increased thickness, and has a high storage capacity since information can be recorded on both sides of the DVD. [0005]
  • To manufacture the above-described DVD, a bonding process is required to bond the two identical disk mediums to each other. The bonding process will be described briefly in conjunction with the entire process of manufacturing the conventional DVD. [0006]
  • First, a photo resist is deposited uniformly on a well-polished glass plate (also known as a glass master substrate), and desired information is recorded on the glass plate by sensitizing the photo resist using a laser beam modulated according to the information to be recorded. A glass master is obtained by developing the photo resist and a metal master is obtained by electroplating the obtained glass master. Then, several mothers can be obtained from the metal master, and subsequently several stampers can be obtained from the mothers. This process is commonly called a mastering process. [0007]
  • A stamper provided by the mastering process is adjusted to fit into an injection molding machine, so that an injection molding process is performed to produce a transparent substrate. The injection molding process injects a polycarbonate resin into the mold containing the stamper, whereby a transparent disk member is obtained. [0008]
  • Next, the obtained transparent disk member is coated with an aluminum reflective film by a sputtering process, which sputters and places metal ions on the transparent substrate. [0009]
  • When the sputtering process is completed, a UV bonding material, e.g., UV resin, is dropped onto the central part of the disk member while the disk is rotated at a high speed. The high-speed rotation of the disk member creates centrifugal force by which the UV bonding material is instantaneously and uniformly distributed over the entire disk member. Lastly, the UV bonding material is cured by irradiating ultraviolet rays on the disk member, whereby a protective layer is formed on the disk member to prevent oxidation of the coated aluminum reflective film. [0010]
  • Then two of the identical disk members formed according to the above-described procedures, each disk member having a 0.6 mm thickness, are bonded to each other to form a conventional DVD. To bond the two disk members, the spin-coating method, hot-melting method, and double-sided tape method are generally used, among which the spin coating method is the most common. [0011]
  • There are two conventional methods, the radical method and cationic method, which use the spin coating process to bond the two disk members to form a conventional DVD. The two methods are similar in that UV bonding materials are applied to the substrate by the spin coating method. A difference between the two methods is that the radical method conducts the bonding process before curing the UV bonding materials, whereas the cationic method completes curing the UV bonding materials before the disk bonding process. The radical method can be considered more common than the cationic method. [0012]
  • FIG. 1 is a flowchart showing a conventional bonding process for forming a conventional DVD. As shown therein, a first disk member is transferred to a bonding machine in Step S[0013] 101. After loading the first disk member onto a motor shaft in Step S103, a UV bonding material is applied onto the central part of the first disk member while the first disk member is rotated at a low speed in Step S105.
  • Subsequently, a second disk member is placed on top of the first disk member and the first and second disk members are rotated at a high speed. The centrifugal force created by the high-speed rotation of the first and second disk members uniformly spreads the UV bonding material over the surfaces of the first and second disk members, thereby securely bonding the first and second disk members to each other in Step S[0014] 107.
  • In Step S[0015] 109, ultraviolet rays are irradiated onto the rotating bonded disk members to cure the UV bonding material, and the bonded disk members are unloaded in Step S111, whereby the bonding process is completed and a conventional DVD is manufactured.
  • The bonding process as shown in FIG. 1, however, has serious problems. For example, the center hole diameter of the finally manufactured DVD exceeds an allowable deviation limit, even though the disk members bonded together satisfy the requirement for the center hole diameter specified by DVD physical format books. [0016]
  • To investigate an error rate caused by the conventional bonding process, experiments of bonding two substrates having a center hole diameter of 15.003 mm have been conducted. The two substrates were made by an injection molding machine by Meiki company and were bonded to each other using a bonding machine with jigs having center hole diameters of 15.001 mm and 15.002 mm. One hundred experiments were performed using each jig and the experimental results indicated that the jig having the center hole diameter of 15.001 mm has an error rate of 22.2% and that the other jig has an error rate of 9.8%. [0017]
  • The centering problem of the conventional bonding process can be solved if the injection molding machine can produce disk members having an identical center hole diameter or if the center hole of the jig can be adjusted to perfectly match that of the substrate. With currently available technology, however, it is almost impossible to satisfy these requirements, such that the centering process of conventional bonding processes has been a major obstacle in the DVD manufacturing process. Moreover, because the bonding process is a significant part of the DVD manufacturing process, any errors caused by the bonding process increase the production cost. [0018]
    • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide an optical medium and a method for manufacturing the optical medium, capable of reducing errors caused by a centering process using a simpler bonding method. [0019]
  • Briefly described, the present invention is directed to a disk medium, including a first disk member having a penetrating hole, and a second disk member having a projecting portion, the projecting portion being placed within the penetrating hole of the first disk member, whereby the first and disk members are combined. [0020]
  • The present invention is further directed to a method of manufacturing an optical medium, including forming a first disk member having a penetrating hole, forming a second disk member having a projecting portion, and positioning the projecting portion of the second disk member within the penetrating hole of the first disk member, whereby the first and second disk members are combined to manufacture an optical medium. [0021]
  • These and other objects of the present application will become more readily apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.[0022]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings, which are included to provide a further understanding of the invention, illustrate the preferred embodiments of this invention, and together with the description, serve to explain the principles of the present invention. [0023]
  • In the drawings: [0024]
  • FIG. 1 is a flowchart showing a bonding process employed in a conventional disk manufacturing method; [0025]
  • FIGS. 2A and 2B show cross-sectional views of first and second disk members of an optical disk, respectively, according to a first embodiment of the present invention; [0026]
  • FIGS. 2C and 2D are cross-sectional views of the optical disk according to the first embodiment of the present invention; [0027]
  • FIG. 3 shows an example of general dimensions of an optical disk according to the embodiments of the present invention; [0028]
  • FIG. 4A shows cross-sectional and top views of a first disk member of an optical disk according to a second embodiment of the present invention; [0029]
  • FIG. 4B shows cross-sectional and top views of a second disk member of the optical disk according to the second embodiment of the present invention; [0030]
  • FIGS. 4C and 4D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 4A and 4B according to the second embodiment of the present invention; [0031]
  • FIG. 5A shows cross-sectional and top views of a first disk member of an optical disk according to a third embodiment of the present invention; [0032]
  • FIG. 5B shows cross-sectional and top views of a second disk member of the optical disk according to the third embodiment of the present invention; [0033]
  • FIGS. 5C and 5D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 5A and 5B according to the third embodiment of the present invention; [0034]
  • FIG. 6A shows cross-sectional and top views of a first disk member of an optical disk according to a fourth embodiment of the present invention; [0035]
  • FIG. 6B shows cross-sectional and top views of a second disk member of the optical disk according to the fourth embodiment of the present invention; [0036]
  • FIGS. 6C and 6D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 6A and 6B according to the fourth embodiment of the present invention; [0037]
  • FIG. 7A shows cross-sectional and top views of a first disk member of an optical disk according to a fifth embodiment of the present invention; [0038]
  • FIG. 7B shows cross-sectional and top views of a second disk member of the optical disk according to the fifth embodiment of the present invention; [0039]
  • FIGS. 7C and 7D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. 7A and 7B according to the fifth embodiment of the present invention; [0040]
  • FIG. 8A shows a cross-sectional view of a first disk member of an optical disk according to a sixth embodiment of the present invention; [0041]
  • FIG. 8B shows a cross-sectional view of a second disk member of the optical disk according to the sixth embodiment of the present invention; [0042]
  • FIG. 8C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 8A and 8B according to the sixth embodiment of the present invention; [0043]
  • FIG. 9A shows across-sectional view of a first disk member of an optical disk according to a seventh embodiment of the present invention; [0044]
  • FIG. 9B shows a cross-sectional view of a second disk member of the optical disk according to the seventh embodiment of the present invention; [0045]
  • FIG. 9C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 9A and 9B according to the seventh embodiment of the present invention; [0046]
  • FIG. 10A shows a cross-sectional view of a first disk member of an optical disk according to a eighth embodiment of the present invention; [0047]
  • FIG. 10B shows a cross-sectional view of a second disk member of the optical disk according to the eighth embodiment of the present invention; and [0048]
  • FIG. 10C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 10A and 10B according to the eighth embodiment of the present invention;[0049]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The preferred embodiments of the present invention will be described in detail referring to the accompanying drawings FIGS. 2A and 2B respectively show cross-sectional views of first and second disk members of an optical disk according to the first embodiment of the present invention. As shown in FIG. 2A, the [0050] first disk member 10 includes a penetrating hole 11 having a diameter of 35 mm (instead of a standard-sized center hole), and has a thickness of 0.6 mm. The second disk member 13 as shown in FIG. 2B includes a cylindrical-shaped projecting portion 15 formed at the center of the second disk member 13, and a ring portion 19 surrounding the projecting portion 15. The projecting portion 15 has a diameter of 35 mm and includes a center hole 17 having a diameter of 15 mm.
  • Each of the first and [0051] second disk members 10 and 13 has an overall diameter of 120 mm. The thickness of the ring portion 19 of the second disk member 13 is 0.6 mm and the thickness of the projecting portion 15 is 1.2 mm. The projecting portion 15 of the second disk member 13 is inserted into the penetrating hole 11 of the first disk member 11. The total thickness of the first and second disk members 10 and 13 as bonded to each other is uniformly at 1.2 mm.
  • A method of manufacturing an optical disk according to the first embodiment of the present invention is described below referring to FIGS. [0052] 2A-2D.
  • First, the [0053] second disk member 13 is loaded on a motor shaft of an injection machine and is rotated at a low speed of, e.g., about 30˜40 rpm. Then, a UV bonding material is applied onto inner parts (e.g., 17˜18 mm from the center) and outer parts (e.g., 118 mm from the center) of the second disk member 13 as shown in FIG. 2B, wherein an appropriate time duration for the application of the UV bonding material may be, e.g., for a 1 ¼ disk revolution. The areas of the second disk member 13 onto which the UV bonding material are applied should have a good optical transmissivity so that the bonding material is easily cured when it is exposed to ultraviolet rays.
  • As shown in FIG. 3, since optical disks may have a clamp area diameter of 50 mm around the center hole, data are recorded on the areas of the optical disk outside the clamp area. Consequently, the UV bonding material may be applied only onto the areas of the [0054] second disk member 13 with no recording or reflective layer (i.e., where data are not recorded).
  • Then the [0055] first disk member 10 is stacked up on top of the second disk member 13 by placing the projecting portion 15 of the second disk member 13 within the penetrating hole 11 of the first disk member 10. Subsequently, the stacked first and second disk members 10 and 13 are rotated at a high speed of, e.g., about 3000 rpm, as shown in FIG. 2C to uniformly spread the applied UV bonding material over the entire surfaces of the disk members 10 and 13.
  • The bonded [0056] disk members 10 and 13 are further rotated during which ultraviolet rays are irradiated onto the UV bonding material of the disk members 10 and 10 to cure the UV bonding material, as shown in FIG. 2D. Then labels can be printed on the bonded disk members 10 and 13 to form an optical disk 100.
  • Since the projecting [0057] portion 15 is fittingly positioned within the penetrating hole 11 as the disk members 10 and 13 are bonded, the overall shape of the optical disk 100 is the same or substantially the same as a standard optical disk formed with two identical disk members. Further, since only the second disk member 13 has the center hole 17, centering is required only for the second disk member 13 during the bonding process, whereby errors due to centering problems are eliminated or significantly reduced. Furthermore, since the UV bonding material is applied only onto the non-recording areas of the optical disk 100, only a small amount of bonding material is used for each optical disk 100. Moreover, the bonding material can be easily cured using low-powered ultraviolet rays.
  • FIG. 4A shows cross-sectional and top views of a first disk member of an optical disk, FIG. 4B shows cross-sectional and top views of a second disk member of the optical disk, and FIG. 4C and 4D are cross-sectional views of the optical disk composed with the first and second disk members of FIGS. [0058] 4B and 4C, all according to the second embodiment of the present invention. The overall dimensions of the first and second disk members in the second embodiment can be the same as those in the first embodiment.
  • As shown in FIG. 4A, a [0059] first disk member 20 includes a penetrating hole 21 formed at the center of the first disk member 20, and a groove 26 circumferentially formed on its inner sidewalls. The thickness of the first disk member 20 can be, e.g., 0.6 mm, and the diameter of the penetrating hole 21 can be, e.g., 35 mm.
  • A [0060] second disk member 23 as shown in FIG. 4B has a projection 28 circumferentially formed on the outer sidewalls of a projection portion 25, a center hole 27 formed at the center of the projection portion 25, and an outer ring portion 29. The projection 28 is fitted into the groove 26 of the first disk member 20. As in the first embodiment of the present invention, only one disk member (the second disk member 23) has the center hole 27. The depth of the groove 26 can be selected so that the groove 26 remains within the clamp area with a diameter of 50 mm, so as to prevent damages to the recording layer which may be caused by the groove 26.
  • When bonding the first and [0061] second disk members 20 and 23 to each other, a UV bonding material can be applied only onto the outer parts of the second disk member 23 as shown in FIG. 4B. Then the first and second disk members 20 and 23 are fitted to each other as shown in FIG. 4C. The high speed rotation of the fitted disk members 20 and 23 causes the UV bonding material to be uniformly distributed to the surfaces of the disk members 20 and 23. Thereafter, ultraviolet rays are irradiated only onto the areas indicated by arrows as shown in FIG. 4D to manufacture an optical disk 200 (e.g., DVD), because the inner parts of the disk members 20 and 23 are secured by the cooperation of the projection 28 with the groove 26 as shown in FIG. 4C.
  • FIGS. [0062] 5A-5D illustrate steps for manufacturing an optical disk according to the third embodiment of the present invention. The third embodiment is similar to the second embodiment including the general dimensions of the disk members, except that the projection and groove are formed on the different disk members. In the third embodiment, a first disk member 40 has a penetrating hole 41 with a projection 48 circumferentially formed on its inner sidewalls 44 as shown in FIG. 5A. A second disk member 43 includes a circumferentially disposed groove 46 on the outer sidewalls 51 of the projecting portion 45 as shown in FIG. 5B. The second disk member 43 further includes a center hole 47 formed at the center of the disk member 43 and the projection-portion 45, and an outer ring portion 49.
  • As shown in FIGS. 5B to [0063] 5D, the area onto which a UV bonding material is applied and the area onto which ultraviolet rays are irradiated are the same as the second embodiment. Accordingly, an optical disk 300 is manufactured.
  • FIGS. [0064] 6A-6D illustrate steps for manufacturing an optical disk according to the forth embodiment of the present invention. The overall shape and dimensions of each of the first and second disk members are similar to those of the first embodiment. But on a surface 64 of a first disk member 60, a ring-shaped groove 66 (e.g., circumferentially formed groove) is formed a predetermined distance away from a penetrating hole 61 as shown in FIG. 6A. A second disk member 63 has a projection 68 circumferentially formed at a prescribed distance from a projecting portion 65, and the projection 68 is fitted into the groove 66 as shown in FIG. 6C. As in the previous embodiments, a center hole 67 is formed only in the second disk member 63.
  • When bonding the two [0065] disk members 60 and 63 according to the fourth embodiment, inner portions of the disk members 60 and 63 are combined by the cooperation of the projection 68 with the groove 66 as shown in FIG. 6C. This scheme allows a UV bonding material to be applied only onto the outer edge portion of the second disk member 63 as shown in FIG. 6B, and the rotation of the fitted first and second disk members 60 and 63 uniformly distributes the UV bonding material throughout the surfaces 64 and 71 of the disk members 60 and 63. Ultraviolet rays are also irradiated only onto the outer areas indicated with arrows as shown in FIG. 6D, whereby an optical disk 400 is finally manufactured.
  • FIGS. [0066] 7A-7D illustrate steps for manufacturing an optical disk according to the fifth embodiment of the present invention. A first disk member 80 includes a penetrating hole 81, and a second disk member 83 includes a projecting portion 85 with a center hole 87. The dimensions of these elements are the same as the previous embodiments. Unlike the fourth embodiment, however, a groove 86 and a projection 88 are formed on the outer circumferential portions of first and second disk members 80 and 83, respectively. When the first and second disk members 80 and 83 are bonded to each other, the outer circumferential portions of the first and second disk members 80 and 83 are securedly combined by the cooperation of the projection 88 with the groove 86 as shown in FIG. 7C. Consequently, a UV bonding material is applied only onto an inner area of the second disk member 83 as shown in FIG. 7B, and the UV bonding material is uniformly distributed due to the rotation of the fitted first and second disk members 80 and 83. Ultraviolet rays are also applied only on an inner area of the combined first and second disk members 80 and 83 as shown by arrows in FIG. 7D. As a result, an optical disk 500 is manufactured.
  • FIG. 8A shows a cross-sectional view of a first disk member of an optical disk, FIG. 8B shows a cross-sectional view of a second disk member of the optical disk, and FIG. 8C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 8A and 8B, all according to the sixth embodiment of the present invention. [0067]
  • As shown in FIG. 8A, a [0068] first disk member 90 includes a penetrating hole 92 with a first groove 91 formed circumferentially on its inner walls, and a second ring-shaped groove 96 formed on the outer parts of the first disk member 90. A second disk member 93 has projections 91′ and 98′ formed circumferentially on the outer walls of a projecting portion 95 and the outer parts of the second disk member 93, respectively, as shown in FIG. 8B. The projections 91′ and 98′ are to be inserted into the grooves 91 and 98, respectively. As in the previous embodiments, a center hole 97 is formed only at the center of the second disk member 93. In this example, the inner and outer parts of the first and second disk members 90 and 93 are securedly fitted to each other by the cooperation of the projections 91′ and 98′ with the grooves 91 and 98 as shown in FIG. 8C. As a result, an optical disk 600 is manufactured without having to apply a UV bonding material and a UV curing process, thereby greatly simplifying the disk manufacturing process. The general dimensions and shapes of the first and second disk members 90 and 93 are similar to the previous embodiments.
  • FIG. 9A shows a cross-sectional view of a first disk member of an optical disk, FIG. 9B shows a cross-sectional view of a second disk member of the optical disk, and FIG. 9C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 9A and 9B, all according to the seventh embodiment of the present invention; [0069]
  • As shown in FIG. 9A, a [0070] first disk member 101 includes a ring-shaped groove 106 on the outer parts of the first disk member 103, which is similar to that of the sixth embodiment. In this example, however, it is not a groove but a projection 105 that is formed on the inner walls of a penetrating hole 102 of the first disk member 101. A second disk member 103 as shown in FIG. 9B includes a projection 106′ and a groove 105′, which are respectively fitted with the groove 106 and projection 105 of the first disk member 101, whereby an optical disk 700 is manufactured. As in the sixth embodiment, neither a bonding material nor a UV curing process is needed because of the use of projections and grooves at the inner and outer parts of the disk members, which simplifies the disk manufacturing process. As in the previous embodiments, the second disk member 101 includes a projection portion 104 and a center hole 107. The general dimensions and shape of the disk members 101 and 103 can be similar to the previous embodiments.
  • FIG. 10A shows a cross-sectional view of a first disk member of an optical disk, FIG. 10B shows a cross-sectional view of a second disk member of the optical disk, and FIG. 10C is a cross-sectional view of the optical disk composed with the first and second disk members of FIGS. 10A and 10B, all according to the eighth embodiment of the present invention. [0071]
  • As shown in FIG. 10A, a [0072] first disk member 110 includes a penetrating hole 107 at the center thereof, and first and second ring-shaped grooves 115 and 116 at the inner and outer portions of the first disk member 110. A second disk member 113 as shown in FIG. 10B includes a projection portion 114 with a center hole 117, and first and second projections 115′ and 116′ at the inner and outer portions of the second disk member 113. The first and second projections 115′ and 116′ are respectively fitted with the first and second grooves 115 and 116, whereby an optical disk 800 is manufactured. As in the sixth and seventh embodiments, neither a bonding material nor a UV curing process is needed because of the use of projections and grooves at the inner and outer parts of the disk members, which simplifies the disk manufacturing process. The general dimensions and shape of the disk members 110 and 113 can be similar to the previous embodiments.
  • The method of manufacturing an optical disk according to the first through eighth embodiments of the present invention forms a center hole only on one disk member of the optical disk, thereby effectively reducing manufacturing errors caused by conventional processes of centering two identical disk members. [0073]
  • Furthermore, a small amount of a UV bonding material is applied only onto the areas with no recording and reflective layers and with high optical transmissivity, whereby curing of the UV bonding material with low-powered ultraviolet rays is permitted and the disk bonding/manufacturing process is significantly simplified. The embodiments of the present invention are applicable to DVDs, DVD-RS, DVD-Rams, DVD-Rows, or the like, which can require two-sided recording capability. [0074]
  • Moreover, the present invention makes it easier to load and unload an optical disk, e.g., DVD, on a clamping device of a disk drive which installs the disk by pressing the upper side of the optical disk, and prevents irregular rotation of the disk. That is, a DVD manufactured by conventional methods has a gap in an attachment area created when two disk members are bonded. When loading such a conventional DVD, a ball in the clamping device elastically supported by a spring is inserted to the gap, which obstructs loading and unloading of the DVD. In the present invention, however, the center of one disk member automatically coincides with that of the other disk member when the two disk members are bonded to or combined with each other because only one disk member has a center hole to be positioned within a projecting portion of the other disk member. Hence, bonding of the two disk members can be easily conducted even without using sensors for disk centering. Further, no gap is created in the inner side of the projecting portion of the disk member, which facilitates loading and unloading of the finally manufactured optical disk and prevents irregular rotation of the optical disk. The use of UV bonding material and the curing process may be completely eliminated by using projections and grooves on the disk members. [0075]
  • The invention may be embodied in other specific forms without departing from the sprit or essential characteristics thereof. For example, the dimensions of the disk members can be varied according to need and desire, a different bonding material or the like may be used instead of a UV bonding material, and the projections and grooves may be selectively formed at different locations or circumferential portions of the disk members. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. [0076]

Claims (28)

What is claimed is:
1. A disk medium comprising:
a first disk member having a penetrating hole; and
a second disk member having a projecting portion, the projecting portion being placed within the penetrating hole of the first disk member, whereby the first and second disk members are combined.
2. A disk medium according to
claim 1
, wherein at least one of the penetrating hole of the first disk member and the projecting portion of the second disk member has a cylindrical shape.
3. A disk medium according to
claim 1
, further comprising:
a projection formed on an inner wall of the penetrating hole of the first disk member; and
a groove formed on an outer wall of the projecting portion of the second disk member, wherein the projection is inserted into the groove to combine the first and second disk members.
4. A disk medium according to
claim 1
, further comprising:
a projection formed on an outer wall of the projecting portion of the second disk member; and
a groove formed on an inner wall of the penetrating hole of the first disk member, wherein the projection is inserted into the groove to combine the first and second disk members.
5. A disk medium according to
claim 1
, further comprising:
a groove circumferentially formed on a side of one of the first and second disk members; and
a projection circumferentially formed on the other one of the first and second disk members to correspond with the groove.
6. A disk medium according to
claim 1
, further comprising:
a groove formed on a first surface portion of the first disk member and surrounding the penetrating hole;
a projection formed on a second surface portion of the second disk member and surrounding the projection portion, whereby the projection is placed within the groove to combine the first and second disk members.
7. A disk medium according to
claim 6
, wherein the first and second surface portions are inner portions of the first and second disk members.
8. A disk medium according to
claim 6
, wherein the first and second surface portions are outer edge portions of the first and second disk members.
9. A disk medium according to
claim 8
, further comprising:
a second groove formed on an inner surface portion of the first disk member; and
a second projection formed on an inner surface portion of the second disk member, whereby the second projection is placed within the second groove.
10. A disk medium according to
claim 4
, further comprising:
a second groove formed on an outer edge portion of the first disk member; and
a second projection formed on an outer edge portion of the second disk member, whereby the second projection is placed within the second groove.
11. A disk medium according to
claim 3
, further comprising:
a second groove formed on an outer edge portion of the first disk member; and
a second projection formed on an outer edge portion of the second disk member.
12. A disk medium according to
claim 11
, further comprising:
a bonding material applied between the first and second disk members.
13. A disk medium comprising:
a pair of bonded disk members, wherein a center hole of a predetermined diameter is formed only on one of the disk members.
14. A disk medium according to
claim 12
, wherein the center hole has the predetermined diameter of 15 mm.
15. A method for manufacturing an optical medium, comprising:
forming a first disk member having a penetrating hole;
forming a second disk member having a projecting portion; and
positioning the projecting portion of the second disk member within the penetrating hole of the first disk member, whereby the first and second disk members are combined to form an optical medium.
16. A method according to
claim 15
, wherein in the forming steps, at least one of the penetrating hole of the first disk member and the projecting portion of the second disk member has a cylindrical shape.
17. A method according to
claim 15
, wherein the step of forming the first disk member further includes:
forming a projection on an inner wall of the penetrating hole of the first disk member; and the step of forming the second disk member further includes:
forming a groove on an outer wall of the projecting portion of the second disk member, wherein the projection is inserted into the groove.
18. A method according to
claim 15
, wherein the step of forming the second disk member further includes:
forming a projection on an outer wall of the projecting portion of the second disk member; and the step of forming the first disk member further includes:
forming a groove on an inner wall of the penetrating hole of the first disk member, wherein the projection is inserted into the groove.
19. A method according to
claim 15
, wherein the forming steps include:
forming a groove circumferentially on a side of one of the first and second disk members; and
forming a projection circumferentially on the other one of the first and second disk members to correspond with the groove.
20. A method according to
claim 15
, further comprising:
forming a groove on a first surface portion of the first disk member to surround the penetrating hole;
forming a projection on a second surface portion of the second disk member to surround the projection portion, whereby the projection is placed within the groove to combine the first and second disk members.
21. A method according to
claim 20
, wherein the first and second surface portions are inner portions of the first and second disk members.
22. A method according to
claim 20
, wherein the first and second surface portions are outer edge portions of the first and second disk members.
23. A method according to
claim 22
, further comprising:
forming a second groove on an inner surface portion of the first disk member; and
forming a second projection on an inner surface portion of the second disk member, whereby the second projection is placed within the second groove.
24. A method according to
claim 18
, further comprising:
forming a second groove on an outer edge portion of the first disk member; and
forming a second projection on an outer edge portion of the second disk member, whereby the second projection is placed within the second groove.
25. A method according to
claim 17
, further comprising:
forming a second groove on an outer edge portion of the first disk member; and
forming a second projection on an outer edge portion of the second disk members.
26. A method according to
claim 25
, further comprising:
applying a bonding material between the first and second disk members.
27. A method of forming an optical disk comprising:
bonding a pair of disk members, wherein a center hole of a predetermined diameter is formed only on one of the disk members.
28. A method according to
claim 27
, wherein in the bonding step, the center hole has the predetermined diameter of 15 mm.
US09/291,953 1998-04-15 1999-04-15 Optical disk having a groove and a projection for combining two disk members Expired - Lifetime US6404730B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1998-13502 1998-04-15
KR98-13502 1998-04-15
KR1019980013502A KR100299241B1 (en) 1998-04-15 1998-04-15 Method for manufacturing optical disc and optical medium

Publications (2)

Publication Number Publication Date
US20010022775A1 true US20010022775A1 (en) 2001-09-20
US6404730B2 US6404730B2 (en) 2002-06-11

Family

ID=19536286

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/291,953 Expired - Lifetime US6404730B2 (en) 1998-04-15 1999-04-15 Optical disk having a groove and a projection for combining two disk members

Country Status (2)

Country Link
US (1) US6404730B2 (en)
KR (1) KR100299241B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1504450A2 (en) * 2002-04-22 2005-02-09 Arkema Optical disc construction
EP1632357A1 (en) * 2004-09-06 2006-03-08 Brother Kogyo Kabushiki Kaisha Rolled-print-medium holder device
US20090285084A1 (en) * 2000-04-25 2009-11-19 Panasonic Corporation Optical disk with plural substrates
US20110036491A1 (en) * 2008-04-24 2011-02-17 Sonopress Gmbh Technique for Aligned Joining of Surfaces of Workpieces

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001006210A (en) * 1999-06-22 2001-01-12 Sony Corp Optical recording medium and disk cartridge
KR20010104034A (en) * 2000-05-12 2001-11-24 정광훈 making of adhesion method used centrifugal forece for D.V.D disc
JP2002170279A (en) * 2000-11-30 2002-06-14 Sony Corp Optical recording medium, its manufacturing method and injection molding machine
KR100411390B1 (en) * 2001-05-16 2003-12-18 정문정보 주식회사 manufacturing method for a test digital video disc
US6779193B2 (en) * 2002-10-28 2004-08-17 Bayer Polymers Llc Digital data storage assembly with particular hub adaptor
US20070039958A1 (en) * 2005-08-19 2007-02-22 Mark Henderson Drink cup lid with disc carrier
US7947352B2 (en) * 2007-04-30 2011-05-24 Mohamed Mohab Sabry Flexible VCD having domed center and method of making thereof
US9034231B2 (en) 2011-04-14 2015-05-19 Berry Plastics Corporation Cup lid
US9364107B2 (en) 2013-03-15 2016-06-14 Berry Plastics Corporation Drink cup lid
US9814334B2 (en) 2014-10-24 2017-11-14 Berry Plastics Corporation Drink cup lid
US10577159B2 (en) 2017-04-07 2020-03-03 Berry Plastics Corporation Drink cup lid
ES2951634T3 (en) 2017-08-07 2023-10-24 Berry Global Inc Method and apparatus for thermoforming an article
USD907997S1 (en) 2018-08-10 2021-01-19 Berry Global, Inc. Drink cup lid
WO2020163461A1 (en) 2019-02-06 2020-08-13 Berry Global, Inc. Polypropylene sheets and articles
US11433591B2 (en) 2019-02-06 2022-09-06 Berry Global, Inc. Process of forming polymeric material
USD911168S1 (en) 2019-03-05 2021-02-23 Berry Global, Inc. Drink cup lid

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2776838A (en) * 1952-12-09 1957-01-08 Herman H Mueller Phonograph record disk with speed control ring
JPS5971146A (en) * 1982-10-14 1984-04-21 Toshiba Corp Information recording medium
US4837784A (en) * 1987-03-14 1989-06-06 Sony Corporation Apparatus for adapting the diameter of a disk-like recording medium
EP0356811B1 (en) * 1988-08-30 1994-11-02 Mitsubishi Rayon Co., Ltd. Optical memory disk hub and method for its production
CA2030899A1 (en) * 1989-11-27 1991-05-28 Masayoshi Kurisu Information rercording media
CA2063002A1 (en) * 1991-04-01 1992-10-02 Edward J. Woo Optical disk with vibration dampening
US5579296A (en) * 1995-01-18 1996-11-26 Cyberwerks Interactive, L.L.C. Optically readable thin film digital data storage medium
US5714222A (en) * 1995-01-23 1998-02-03 Canon Kabushiki Kaisha Optical recording medium and process for producing same
US5713463A (en) * 1996-08-15 1998-02-03 30G, Inc. Folding data disk holder
US6070752A (en) * 1997-09-26 2000-06-06 East End, Inc. Combined merchandise container and display device
US5997976A (en) * 1998-02-12 1999-12-07 Wea Manufacturing Inc. Etched mold surface for use in making light-readable discs

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090285084A1 (en) * 2000-04-25 2009-11-19 Panasonic Corporation Optical disk with plural substrates
EP1504450A2 (en) * 2002-04-22 2005-02-09 Arkema Optical disc construction
EP1504450A4 (en) * 2002-04-22 2006-12-13 Arkema France Optical disc construction
EP1632357A1 (en) * 2004-09-06 2006-03-08 Brother Kogyo Kabushiki Kaisha Rolled-print-medium holder device
US20060051152A1 (en) * 2004-09-06 2006-03-09 Brother Kogyo Kabushiki Kaisha Rolled-print-medium holder device
JP2006069789A (en) * 2004-09-06 2006-03-16 Brother Ind Ltd Roll-shaped printing medium retaining device
CN100453332C (en) * 2004-09-06 2009-01-21 兄弟工业株式会社 Rolled-print-medium holder device
US7677823B2 (en) 2004-09-06 2010-03-16 Brother Kogyo Kabushiki Kaisha Rolled-print-medium holder device
US20110036491A1 (en) * 2008-04-24 2011-02-17 Sonopress Gmbh Technique for Aligned Joining of Surfaces of Workpieces

Also Published As

Publication number Publication date
KR19980025358A (en) 1998-07-06
US6404730B2 (en) 2002-06-11
KR100299241B1 (en) 2001-10-27

Similar Documents

Publication Publication Date Title
US6404730B2 (en) Optical disk having a groove and a projection for combining two disk members
KR100758076B1 (en) Manufacturing method, manufacturing apparatus of optical information recording medium, and optical information recording medium
JP4262707B2 (en) Optical information recording medium and method of manufacturing optical information recording medium
KR100952067B1 (en) Optical recording medium
JP2002170279A (en) Optical recording medium, its manufacturing method and injection molding machine
JPH10283683A (en) Optical recording medium and its manufacture
JPH1173691A (en) Production of optical disk and optical disk produced by that method
US7680018B2 (en) Optical recording medium, and manufacturing method and manufacturing device thereof
JP2569627Y2 (en) Optical disk substrate
JPH08180457A (en) Optical disk and its manufacture
WO2004003902A1 (en) Optical recording medium, production method and production device for optical recording medium
US20040158848A1 (en) Optical disk and method for manufacturing the same
EP1515325A2 (en) Method for manufacturing a multilayer recording type optical recording medium and an intermediate in the manufacturing process of the same
EP1581942B1 (en) Magnetically clamped optical disc and apparatus
JPH10112081A (en) Method for sticking optical disk and sticking device and optical disk formed by this method
KR100922428B1 (en) Apparatus for attaching and detaching cap for optical disc spin-coating, apparatus for optical disc spin-coating using the same and method for preparing an optical disc using the same
JPH11345436A (en) Production of optical recording medium and apparatus for manufacturing optical recording medium
JP2000276785A (en) Apparatus for production of optical recording medium
EP1512522A2 (en) Method for manufacturing optical recording medium
JP2003242694A (en) Method for manufacturing optical recording medium
JPH1166641A (en) Stamper for multilayered optical disk and multilayered optical disk
JP2002237106A (en) Method of manufacturing optical recording medium
JP2004178751A (en) Optical disk
JPH10222873A (en) Optical disk
JPH11102544A (en) Manufacture for disk-shaped recording medium

Legal Events

Date Code Title Description
AS Assignment

Owner name: LG ELECTRONICS, INC., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YEO, WOON-SUNG;KIM, HYUNG-KYU;REEL/FRAME:009913/0772

Effective date: 19990413

STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 12